自流平水泥灌孔沥青碎石路用性能研究

发布时间：2018-04-06 22:37

本文选题：自流平水泥灌孔沥青碎石　切入点：路用性能　出处：《重庆交通大学》2015年硕士论文

【摘要】：本文主要研究了自流平水泥灌孔沥青碎石复合材料的制备成型,确定了母体沥青碎石的级配及油石比,并且研究了自流平水泥浆的性能并对其改性,得到了其流动度,抗压拉强度及收缩率指标。复合材料成型后研究其高温稳定性,低温稳定性及水稳性这三大路用性能指标,并与灌入普通水泥浆沥青碎石复合材料做对比,然后研究了复合材料抗压强度抗弯拉强度随龄期变化规律,测定了其抗压回弹模量及劈裂强度,为路面结构组合设计提供了参数依据。拟定两种路面结构组合形式,通过路面结构行为评价两种结构组合(自流平水泥灌孔沥青碎石复合材料分别做上面层和下面层)的优劣。最后得出以下研究内容及结论:在参考国内外文献及书籍确定了母体混合料矿料级配为单一粒径的碎石,粒径范围分别为9.5-13.2mm和16-19mm。进行肯塔堡飞散试验并且在马歇尔试验测定稳定度的基础上确定了母体沥青碎石最佳油石比分别为2.0%和1.8%。参考师兄论文定出灌浆用普通水泥水灰比及膨胀剂减水剂掺量并与本文研究自流平水泥净浆对比,得出流动度及抗压抗拉强度,和干燥开裂试验收缩率。半柔性路面复合材料车辙试验动稳定度都在10000次/mm以上,要远远高于普通AC-13密集配沥青混凝土1054次/mm;灌自流平水泥浆所得复合材料的动稳定度I型灌自流平水泥净浆比灌水灰比0.46普通净浆高接近70%。低温稳定性能按应变能密度这一指标比较顺序:自流平水泥沥青碎石AC-13混合料普通水泥沥青碎石。自流平水泥灌浆沥青碎石浸水前后稳定度都要高于水灰比0.46普通水泥灌浆沥青碎石,水泥灌浆沥青碎石的水稳定性能(即残留稳定度)与灌入水泥浆的程度有很大关系,与残留稳定度关系不大。自流平水泥灌孔沥青碎石抗压回弹模量大于普通水泥抗压回弹模量,但仍在沥青混合料设计参数范围内。试验测得的抗压回弹模量和劈裂强度为半柔性路面结构组合设计提供了参数依据。
[Abstract]:In this paper, the preparation and molding of self-leveling cement filled hole asphalt macadam composites are studied, the gradation and oil stone ratio of parent asphalt macadam are determined, and the properties of self-leveling cement slurry are studied and modified, and the fluidity of self-leveling cement slurry is obtained.Compressive tensile strength and shrinkage index.After molding, the three main road performance indexes, namely, high temperature stability, low temperature stability and water stability, were studied, and compared with the composite materials filled with ordinary cement slurry asphalt macadam.Then, the variation of compressive strength and flexural tensile strength with age is studied, and the compressive resilience modulus and splitting strength are measured, which provides the parameter basis for pavement structure combination design.In this paper, two kinds of pavement structure combinations are proposed, and the advantages and disadvantages of the two structures are evaluated by the pavement structure behavior (the self-leveling cement filled hole asphalt macadam composite material is used as the upper layer and the lower layer respectively).Finally, the following research contents and conclusions are obtained: referring to the domestic and foreign literature and books, the gradation of the matrix mixture mineral aggregate is determined as a single particle size crushed stone, the particle size ranges from 9.5-13.2mm to 16-19mm.Based on the stability determined by Marshall test, the optimum ratio of asphalt macadam to stone was determined to be 2.0% and 1.8%, respectively.The water cement ratio of ordinary cement for grouting and the amount of water reducing agent for expansion agent are determined with reference to the paper. The flow degree, compressive and tensile strength and shrinkage rate of dry cracking test are obtained by comparing with the study of self-leveling cement paste in this paper.The dynamic stability of semi-flexible pavement composite rutting test is above 10000 times / mm.The dynamic stability of type I self-leveling cement paste is 1054 times higher than that of irrigated cement paste.The stability at low temperature is in the order of strain energy density: Self-leveling cement asphalt macadam AC-13 mixture ordinary cement asphalt macadam.The stability of self-leveling cement grouting asphalt macadam before and after soaking is higher than that of ordinary cement grouting asphalt macadam with water-cement ratio 0.46. The water stability (i.e. residual stability) of cement grouting asphalt macadam is related to the degree of cement slurry pouring.There is little relation between residual stability and residual stability.The compressive resilience modulus of self-leveling cement filled hole asphalt macadam is higher than that of ordinary cement, but it is still within the range of asphalt mixture design parameters.The compressive resilience modulus and splitting strength obtained from the test provide a parameter basis for the structural combination design of semi-flexible pavement.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【参考文献】